The 14 meter long ferry Adler I went aground on the Kiel Canal near Holtenau, Germany.   The vessel was en route from Wik when it attempted to berth.   Two earlier attempts had missed the pier and the third attempt ran the vessel onto the embankment.   The vessel was able to refloat itself and later docked.   The water police conducted an investigation with drug and alcohol tests negative.   The Adler I will be inspected for damage by divers the next day.   No reports of injuries or pollution being released.